\pgfkeys{/tikz/.cd,
	vertical factor/.initial=0.5,
	vertical factor/.get=\vertfactor,
	vertical factor/.store in=\vertfactor,
	start coordinate/.initial=

		{

			0,\vertfactor

		}

	,
	sample line width/.initial=very thick,
	start coordinate/.initial =

		{

			another/. style=

				{

					0,\vertfactor

				}

		},
	sample line width/.get=\samplelinewidth,
	start coordinate/.initial=
		{0,\vertfactor
		}
		{something else
		},
}
